------------[ cut here ]------------
kernfs: can not remove 'nr_tags', no directory
WARNING: CPU: 0 PID: 5652 at fs/kernfs/dir.c:1684 kernfs_remove_by_name_ns+0xfe/0x160 fs/kernfs/dir.c:1683
Modules linked in:
CPU: 0 UID: 0 PID: 5652 Comm: syz-executor.0 Not tainted 6.11.0-next-20240927-syzkaller-12878-g40e0c9d414f5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:kernfs_remove_by_name_ns+0xfe/0x160 fs/kernfs/dir.c:1683
Code: 48 89 df e8 34 ee ff ff 48 89 df e8 bc 8d ff ff 31 db eb 2b e8 03 c0 57 ff 90 48 c7 c7 c0 e6 1b 8c 4c 89 e6 e8 d3 bb 18 ff 90 <0f> 0b 90 90 bb fe ff ff ff eb 12 e8 e2 bf 57 ff bb fe ff ff ff 4c
RSP: 0018:ffffc90004aef8a0 EFLAGS: 00010246
RAX: 7d368c66ad0c3900 RBX: ffffffff8f06d560 RCX: ffff88802034da00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff8155d402 R09: fffffbfff1cf9fd8
R10: dffffc0000000000 R11: fffffbfff1cf9fd8 R12: ffffffff8c5f4500
R13: 0000000000000000 R14: ffffffff8c5f44a0 R15: 0000000000000000
FS:  00007fd2d98456c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd2d9824d58 CR3: 0000000030658000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kernfs_remove_by_name include/linux/kernfs.h:625 [inline]
 remove_files fs/sysfs/group.c:28 [inline]
 sysfs_remove_group+0xfe/0x2c0 fs/sysfs/group.c:319
 sysfs_remove_groups+0x54/0xb0 fs/sysfs/group.c:343
 __kobject_del+0x84/0x310 lib/kobject.c:595
 kobject_del+0x45/0x60 lib/kobject.c:627
 blk_mq_unregister_hctx block/blk-mq-sysfs.c:155 [inline]
 blk_mq_sysfs_unregister_hctxs+0x228/0x300 block/blk-mq-sysfs.c:283
 __blk_mq_update_nr_hw_queues block/blk-mq.c:4811 [inline]
 blk_mq_update_nr_hw_queues+0x64b/0x1b00 block/blk-mq.c:4866
 nbd_start_device+0x16c/0xaa0 drivers/block/nbd.c:1413
 nbd_start_device_ioctl drivers/block/nbd.c:1464 [inline]
 __nbd_ioctl drivers/block/nbd.c:1539 [inline]
 nbd_ioctl+0x5dc/0xf40 drivers/block/nbd.c:1579
 blkdev_ioctl+0x57d/0x6a0 block/ioctl.c:693
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd2d86798e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd2d98450c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd2d878bf60 RCX: 00007fd2d86798e9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007
RBP: 00007fd2d9845120 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 000000000000000b R14: 00007fd2d878bf60 R15: 00007fff4bbf8fb8
 </TASK>